The correct answer is: A. None follows
The first statement is “All aeroplanes are trains.” This means that every aeroplane is a train. The second statement is “Some trains are chairs.” This means that there are some trains that are chairs.
From these two statements, we cannot conclude that some aeroplanes are chairs. This is because the second statement does not say anything about aeroplanes. It only says that some trains are chairs.
We also cannot conclude that some chairs are aeroplanes. This is because the first statement does not say anything about chairs. It only says that all aeroplanes are trains.
We cannot conclude that some chairs are trains. This is because the second statement only says that some trains are chairs. It does not say that all trains are chairs.
We cannot conclude that some trains are aeroplanes. This is because the first statement only says that all aeroplanes are trains. It does not say that all trains are aeroplanes.
Therefore, none of the conclusions follow.